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| Registros recuperados: 34 | |
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| CORREIA, J. R.; LOBO-BURLE, M.; CALDERANO, S. B.; SPERA, S. T.; GOMES, I. A.; SANTOS, R. D. dos; CAMPOS, J. E. G.; SILVA JUNIOR, M. C. da; NASCIMENTO, R. de O.; MINELA, G.; REATTO, A.; DUARTE, M. N.. |
| bitstream/CPAC-2009/24674/1/doc_47.pdf |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Soil chemicophysical properties.; Cerrado; Classificação do Solo; Física do Solo; Geomorfologia; Geologia; Mineralogia; Perfil do Solo; Química do Solo; Solo; Vegetação.; Geomorphology; Geology; Mineralogical soil types; Mineralogy; Soil profiles; Soil classification; Soil; Vegetation.. |
| Ano: 2001 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559147 |
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| MARTINS, J. C.; MARTINS, E. de S.; REATTO, A.. |
| ABSTRACT: The micas are rock forming mineral of the phyllosillicates group. The weathering of these minerals is fundamental in the understanding of potassium, silicon and magnesium liberation processes to the soil. the existent studies shown that the main factors that control the micas weathering are the pH of the solutions, the temperature, the size of the particles and the superficial area. The micas weathering is incongruous, in other words, always new minerals are formed as dissolution products, as vermiculite, kaolinite and goethite. These products can precipitate in the surface of the mica, especially the iron oxides of iron, and they impede the contact with its surface, reducing the dissolution kinetics. The structure of the micas is also a decisive... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Dissolução mineral; Intemperismo; Modelo experimental; Mineral dissolution; Experimental models.; Mineralogia; Solo.; Mineralogy; Soil; Weathering.. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568958 |
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| REATTO, A.; MARTINS, E. de S.; GUIMARÃES, E. M.; SPERA, S. T.; SIMM, K. M. C. de B.; CORREIA, J. R.. |
| A Bacia do rio Jardim constitui a principal sub-bacia do rio Preto, localizada na parte Leste do Distrito Federal. Nessa regiao e produzido a maior parte de graos, hortalicas, frutas, gado de corte, frango e leite. Os Latossolos compoem aproximadamente 65% das terras, representando a classe de solo de maior importancia agricola. O objetivo deste trabalho foi avaliar a variabilidade mineralogica de Latossolos dessa Bacia. As amostras dos Latossolos foram coletadas em sete perfis, durante o Levantamento Semidetalhado da Bacia do rio Jardim, realizado pela Equipe de Pedologia da Embrapa Cerrados. Essas foram submetidas a caracterizacao fisica (analise granulometrica); quimica (ataque sulfurico) e mineralogica (sseparacao das fracoes com NaOH),... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Rio Jardim; Distrito Federal; Brasil.; Cerrado; Latossolo; Mineralogia; Solo.; Ferralsols; Brazil; Mineralogy; Soil.. |
| Ano: 1999 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555309 |
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| Ratie, G.; Jouvin, D.; Garnier, Julien; Rouxel, Olivier; Miska, S.; Guimaraes, E.; Cruz Vieira, L.; Sivry, Y.; Zelano, I.; Montarges-pelletier, E.; Thil, F.; Quantin, C.. |
| Although Ni isotopes have been shown to be significantly fractionated in terrestrial samples, their use in continental environmental studies has not yet been evaluated. The present study focuses on an ultramafic (UM) massif (Barro Alto, Goias, Brazil) because such areas are naturally rich in Ni. We present developed lateritic weathering profiles. The goal of the study is to evaluate the potential of using Ni isotopes in environmental continental studies by combining its isotopic signature with mineralogy, in order to better understand the geochemical cycling of Ni in UM settings during weathering. As such, Ni isotope values were measured in samples from the Barro Alto UM complex in the main stages of the lateritic weathering profile of UM rocks, including... |
| Tipo: Text |
Palavras-chave: Nickel; Isotope; Weathering; Mineralogy; Soil. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00254/36553/35098.pdf |
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| Schweizer, C.R.. |
| The Vaterländisches Museum in Prague was officially founded in 1822 by Caspar and Franz Sternberg as a manifestation of Bohemian nationalism. It aimed at 1) the education of the public, 2) the sponsorship of Bohemian scientific and cultural research, and 3) the economical utilization of scientific knowledge. Under these aspects also the development of the oryctognostic collection of the museum should be regarded. In 1818, private mineral collections were donated. After its official opening in 1822, the united collections were split into two parts, a systematic and a local native collection. The first was basically distinguished by a prominent sortiment of gems, particularly by the typical garnet species and varieties, furthermore by the meteorites of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 19th century; Bohemia; Museum; Collections; Research; Mineralogy; 38.30. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215469 |
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| Villacrés, J.; Goyes A., P.. |
| En este trabajo se presentan los resultados de los análisis realizados sobre los sedimentos superficiales de fondo en Bahía Chile, Isla Greenwich, desde el punto de vista granulométrico y mineralógico. En un total de 18 muestras del área se observa una predominancia de limos muy mal seleccionados, platicúrticos y con asimetría hacia los tamaños finos. Mineralógicamente, se observa mayor concentración de minerales livianos sobre los pesados, con altos porcentajes de fragmentos de rocas igneas, deduciéndose que son sedimentos inmaduros y que el área fuente se encuentra en una zona cercana. Los sedimentos depositados en la bahía son de orígen mixto: Procedentes de la erosión de las formaciones costeras y en menor porcentaje, del aporte de organismos marinos.... |
| Tipo: Journal Contribution |
Palavras-chave: Granulometry; Mineralogy; Sediment mixing; Heavy minerals; Igneous rocks; Light minerals; Mineralogy. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/3770 |
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| Chkioua, A.; BRAHIM, M.. |
| Les résultats des analyses granulométriques et minéralogiques des sédiments de surface du golfe de Tunis, prélevés à différentes profondeurs entre Sidi El Mekki et le Cap Bon, ont permis d’identifier l’origine de ces sédiments et de préciser les modes de transport et de dépôt. L’étude granulométrique a montré que les matériaux détritiques dans le golfe de Tunis sont d’origine continentale. L’étude minéralogique a permit de mettre en évidence une nette relation entre le stock sédimentaire récent du golfe de Tunis et les formations géologiques bordières. La répartition des sédiments grossiers et fins dans le golfe de Tunis est contrôlée par les courants généraux de la méditerranée. Le passage des courants généraux dans le golfe conditionne la présence... |
| Tipo: Journal Contribution |
Palavras-chave: Dynamics; Grain size; Granulometry; Mineralogy; Sediment analysis; Sediment distribution. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/4254 |
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| Registros recuperados: 34 | |
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